Thus we have now shown that the system at \(X=T=0\) , which is a saddle point of the potential, is highly unstable. This is due to the tachyons with blowing up negative masses at \(t\rightarrow 0\)  as we see in eq. (REF ).
We have also shown that the model defined by eqs. (REF ), (REF ) and studied in [1]}, which according to this paper represents de Sitter supergravity at \(t=0\) , actually does not have a well-defined limit \(t \rightarrow 0\) . In particular, the tachyonic masses of the canonical scalar fields blow up in this limit. Also the action at non-vanishing scalar values diverges for \(t\rightarrow 0\) , but at vev's \(X=T=0\)  the action is finite. Of course we still have quantum vertices with scalar and fermion couplings proportional to \(\tilde{g} \sim {1\over t}\)  and to \(\tilde{\gamma }\sim {1\over t}\) .
